Bevel-gear generator.



G. D. SUNDSTRAND.

BEVEL GEAR GENERAT OR. APPLICATION FILED DEC- h l9l6,

1,244,659. Patented Oct. 30,1917;

6 SHEETS -SHEET I.

G. D. SUNDSTRAND.

BEVEL GEAR GENERATOR.

APPLICATION FILED DEC. 1.

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BEVEL GEARGENERATOR.

APPLICATION FILED 05c. I. 1916.

Patented Oct. 30, 1917.

6 SHEETS-SH-EET 3.

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l HHHHH!ummmumumnnmmj G. D. SUNDSTRAND.

'BEVEL GEAR GENERATOR.

APPLICATION FILED ate. 1. 19:6.

Patented Oct, 30, 1917.

5 SHEETS--SHEET 4 FICAL 51 A u m GQD. SUNUSTHAND. BEVEL GEAR GENERATOR. APPucMmn FILED 0501,1915.

G. 'D. SUNDSTRAND. BEVEL GEAR GENERATOR. APPLICATSUH FILED DECLI. 191s.

Patented Oct. 30,1917.

. plano of dotted line "3 is a sectional -mg the gear-blank. Fig.

tail of one UNITED. STATES PATENT OFFICE.

GUSTAF IlJAVID SUNDSTRAND, OF

ROCKFORD, ILLINOIS,

ASSIGNOB TO ROCKFORD TOOL COMPANY, OF BOGKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

BE VEL- GEAR GENERATOR.

Specification of Letters Patent.

Patented Oct. 30, 1917.

Application flied December 1, 1918. Serial 110.134,!!80.

To all whom it may concern t Be it known that I, Gns'rar DAFID SUND- srnimn, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Bevel-Gear Generators, of which the followingr is a specification.

his invention relates to in the type of bevel-gear g nerators shown in the Patents Nos. 547,5 588,738 and 605,982 granted to H. C. WVarren.

Among the objects of the invention are to provide improved means for producing the generating movement of the gear-blank and cutters; to improve the means for in dexing the gear-blank; to improve the means for automatically reversing the direction of travel of the cutters; and to simplify the drive for the cuttersQ In the accompanying drawings, Figure 1 a. side elevation of a bevel-gear generator improvements embodying the features'of my invention.

of the side opposite to that Fig. 2 is a view Fig. 2 isa fragmental front seen in Fig. 1.

TJEW of the blank-supporting, rolling and indexing ClUVICQSw Fig. 3 is a vertical secapproximately in the 3-3 of Fig. 4. Fig. view of the reversible drive for the cutter slides. Fig. 4- is a horizontal sectional view taken approximately in the plane indicatedby dotted line 4 in Fig. 1.

ig. 5 is a fragmental sectional view showing, among other things, the means for roll- 6 is a vertical sec t onal .vlew taken in the plane of dotted line 6'of Fig. 3. Fig. 6 is a'fragmental deof the cutters. Fig. 7 is a.sec tion on dotted line 7? of Fig. 6. Fig. 7 is a section on line a of Fig. 7. Fig. 8 is a sectional view taken approximately in the plane of line a of Fig. 3 but showing the clutch in neutral position. Fig. 9 is a view of the cutters and adjacent parts. Fig. t) is, a section on dotted line a--a of Fig. 9 Fig. 10 is a top dexing mechanism and tional view taken adjacent parts.

Fi 11, 12 and 13 are sectional views of the in exing mechanism, Fig. 11 being taken in the plane of dotted line 11 of Fi Fig. 12 being a view on dotted Fig. 13. Figs. 13 and 13 13,.and inc 12 of plan view of the blank-inare detail views of a part of the indexin mechanism showing different positions. ig. 13' is a section on dotted line a of Fig. 13. V

In generating eanteeth with the machine hereinshown, t e conical gear-blank which will, of course, be of the requisite size for producing a finished, gear-wheel of the desired size, will be intermittently and progressively advanced, rotatively, a tootharc distance at each movement thereof to bring the tooth-forming portions of the blank successively into position to be acted upon by the cutters, and at thecompletion of eachintermittent rotative movement of said blank the cutters will be fed rogressxvely forward along the tooth-forming face erate by a sinuous cutting operation a theoretically-correct tooth-face, all of which will be more fully hereinafter described.

Owing to the fact that the s aces between teeth in bevel-gears are of gra ually reduced width toward the apexes thereof, I employ a relatively thin cutter adapted for freely passing through the narrowest part of tho' tooth space, and for this purpose, and also of the cutters in lines for the purpose of facilitating the operation of genera ting a full complement of gear-teeth in the gear-blank and to obviate the necessity of revolving the gear-blank more than once, I preferably employ in connection with the organization of mechanism illustrated in the drawings, a face generating-cutters herein shown as circular milling-cutters, and two in numher) in position and adapted for generating the adjacent faces of adjacent teeth, one cutter acting upon and enerating one face of one tooth, and the ad acent cutter actin upon and dgenera-ting the adjacent face 0 the next a acent moth.

The embodiment herein shown of the inlurality of tooth- '33, a portion of said nut extendin vention comprises a base or main 'frame 1 having a circular guide 2 upon which is mounted a table 3. The table has a central hub or bearing 4 (Fig. 3) which is rotatably mounted upon a vertical pivot 5 fixed to the base 1. The table is oscillated upon the pivot 5 b means includin a bevel ar segment 6 Figs. 2 and 3) xed to t e table, said segment meshing with a beve 'pinion 7. The inion 7 is secured upon a-sha 8 which has xed thereto a bevel gear 9 that meshes with a similar gear 10. Rigid with the an 10 is a gear wheel 11 (Figs. 2 and 4) w ich meshes with a gear wheel 12. The gear wheel 12 is mounted upon an arm 12 that may be raised to disengage the gear 12 from the gear 11 for a urpose to appear hereinafter. The ear wheel 12 meshes with a gear wheel 13 w ichis fixed upon one end of. a rocker shaft 14. U on the other end of the shaft 14 is releasabiy clamped a gear'wheel 15 that meshes with a segment 16 (Fig, 1) pivoted at 17. Rigid with the gear segment 16 is an arm 18 to which is ad ustahly connected a pitman 19 which is pivoted upon a wrist pin 20 carried by the gear wheel 21. The gear wheel 21 meshes with a pinion 22. Rigid with the inion 22 is a ar wheel 23 that meshes with a pinion 24 xed upon the drive shaft 25. Said shaft carries a drive pulley 26. l j

Upon the table 3 are two guides 27 (Fi 4 and 9). In the lower faces of these gui es are formed grooves 28.whichv are. curved upon the arcs of acircle concentric withthe pivot 5. In these grooves are-curved 'de ribs29 which are rigidly fixed to the ta 1e 3. It will be seen that the guides 27 ma be turned so as to diver moreor less m each other, as shown 1n Fig. 4, the guides being held in adjusted position by means of; nuts 30 turned upon screw studs 31 which are fixed to the table and extend through longitudinal openings in the ides. The angle between the guides 27 epends upon the itch of the or to be cut; I

pon the gui cs 27 are mounted cuttersupporting slides 32 (Figs 9 and 9) each provided with a guide 33, said guide having two guide flanges 34 overhanging opposite sides of the guideway. Within the ide is a bearing 35 having longitudinaf guid'e shoulders 36 adapted to slide in contact with the guide flanges 34. 37 is a nut mounted upon a screw 38 which is fixed-in the guide into a 'rece'ss 39'in'the bearing 35. It wil be seenv that by rotati ma:ybe slid wi l the nut 37"the hearing 35 tiin the guide 33. After the bearing hasbeen longitudinally adjusted to the desired 'position'by nieans of the nut 37,

' the b a ng. is.. vInclined in suchi position by 'bearingfand the slide 32, said wedge being as means eta wedge40xinterposed between the mim sa! i t i an! 42" m unt d worm wheel 69 (Figs. 3 and 6) which 1,244.,eao

on a screw 40 fixed in the seat, a portion of said nut engaging within a recem 40 in the wed T e milling cutters 41 are fixed upon the adjacent ends of shafts 42 and 43 supported in the bearings 35. The cutters are arranged side'byside'but in planes inclined to each other. -The teeth of the cutters 41 are arranged to mesh at the upper portions of said cutters. It will be evident that by means of the nuts 37 the cutters 41 may be adjusted toward or away from each other. however, need be done only when erecting the machine or when putting on new cutters. When the axes of the cutters intersect the axis of the table 3, the peripheral edges of the cutting faces of the cutters should be tangent to each other at the apex of the by reason of the fact that the cutters 41 are in mesh with each other. Fixed to the shaft 42 is a worm wheel 44 that meshes with a worm 45 fixed upon a shaft 46. A shaft -'47 (Fig. 2) is connected to the shaft 46 by hub 50v which is rotatably supported in the gear case. The gear wheel 48 is chambered to receive a disk 51 havin a hub 51 through which the shaft 47 is sli able. A spline 52' (Fig. 7,) compels the shaft 47 to rotate with the disk 51. Pins 53 fixed to the wheel 48 and lying loosely within notches 51 in' the disk 5L serve to drive said disk The gear 48 meshes with a gear 54 which is rigid with a gear 55.v The ear 55 meshes with a gear 56. (Fig. 6) which last mentioned gear is rigid with a gear 57 that meshes with a gear 58.. Thegear 58 meshes with a gear wheel 59 (Fig; 3) which is fixed u on a shaft 60. 'Rigidly' mounted on the she; t 60. is a bevel igear 61 that meshes with a bevel gear 62 within the tubular pivot 5. Fixed upon the shaft 63 is a bevel gear 64 that meshes with a bevel pinion 65 (Fig. 4) which is fixed upon the'drive shaft 25.

The means for reciprocating the slides 32 comprises/a lead screw 66 (Fig. 3), said lead screw being mounted in suitable bearings upon'the table '3 and in the gearcasc 49, and extending between the slides 32. Upon the lead screw 66 is a nut 67 which is connected by means of links 68 (Fig. 4) to the slides 32. The lead screw 66 is ro tated alternately in opposite directions in order to reciprocate the slides 32. The means for rotating the lead screw 66in the forward or cutting direction comprises a tata-bly mounted upon the lead screw;

This,

xed upon a vertical shaft 63 supported meshes with a worm 70. The worm 70 is driven through the gear train 71,- 72, 73, 74. v

75 and 76, the bevel gear 76 being fixed upon the shaft 60. It will be remembered that this shaft is constantly driven from the main shaft 25 through the gear train shown in Figs. 3 and 4.

The means for rotating the lead screw 66 in the reverse direction to return the cutters to initial (Fig. 3) loosely mounted upon said lead screw and meshing with the gearwheel 59 fixed on the shaft 60.

he gear wheels 69 and 77 (Fig. 3) run in opposite directions and are alternately clutched to thewlead screw 66 by means of a clutch member 78 (Figs. 3 and 8), said clutch member being slidable longitudinally of the lead screw but connected thereto by means of a spline, so that the clutch memher and the lead screw rotate together. The clutch member 78 is adapted to engage clutch faces secured to the sides of the gear wheels 69 and 77. Theclutch member is provided with a peripheral groove in'which lie two shoes 79 (Fig. 8) which shoes are pivoted to a yoke 80 which, in turn, is mounted upon a pivot 81. Rigid with the yoke 80 is a hand-lever 82- The hand lever may be fixed in neutral position by means of a pin 83 adapted to be inserted into registering openings in the hand lever and a. lug 84 on the gear case 49. Loosely mounted upon the pivot 81 is an arm 85. Said arm has twooppositely-cxtending ll'lgs 85" that overlie lugs 80" on the yoke '80. 85 carry stop screws 85 that are arranged to engage the lugs 80. It will be apparent from Fig. 3 that limited pivotal movement .is possible between the yoke 80 and thearm 85. Said arm carries a spring plunger 86 that has a V-shaped end adapted to engage a V-shaped tooth 87 on the gear case 49. A rod 88 is longitudinally slidable in the gear case 49 and has fixed thereto two collars89 (Figs. 3 and 8) between which the arm 85 lies. Rigid with the rod 88 IS an arm 99 to which is fixed a rod 91 (Fig. 3) which extends freely through a lug 92 that is rigid with the nut 67. On the rod 91 are two collars 93 and 9 at opposite sides of the lug 92. The collars 93 and 94 are adjustably secured upon the rod 91 so that they may be set at different points along the lci'lgth of said rod in order to effect the shifting-of the clutch collar 78 at'dcsircd times, Assuming the clutch collar to be in engagement with one of the lcad-screw-driving wheels 69 and 77, it will be seen that when the lgg 92 collides with one of the cqllars 93 and 94, the rod 91 will be moved in the coi'ltinuing movement of whereby the FlY'l'l'l 85willl1e moved until the V-shapcd' end of the plunger 86 has passed 87, wherethe point of the V-shaped tooth position comprises a gear wheel 77 The lugs I the lug 92,

upon the pressure of the spring plunger against the V-shaped tooth will cause the arm 85 to complete its movement and place the clutch collar 78 in engagement with the other lead-screw-driving wheel. The lostmotion connection between the yoke 80 and the arm 85 permits the clutch member 78 to remain in engagement with one driving wheel until the point of the tooth 86 has passed the point of the tooth 87, when the continuing movement of the arm 85 causes the yoke to swing to move the clutch member into engagement with the other driving wheel.

The return movement imparted to the slides 32 through the is more rapid than the feed movement derived through the worm wheel 69.

e forward end of the lead screw 66 is squared to receive 'a hand crank (not shown).

The gear-blank a may be secured to the work spindle 95 by means of a clamping rod 96, said rod having a head 97 at and a nut 98 at the other end. A spacer 99 of any suitable form. and dimensions may interposed between the blank and the lower end of the spindle 95. The spindle is rotatably supported in a bearing 100- (Fi 2) carried by a slide 100, which slide is a justably secured to a support or frame 101 one end screw engaging a sleeve-nut 100 fixed to I the frame 101.

The axis of the spindle 95 intersects the axis of oscillation of the table 3. The bearin 100 and hence the spindle'95 are adjustab e in the direction of their: aL-cis toward and away from the table 3 to a position suitable for a gear-blank of the diameter to be operated upon. The frame 101 has a trunn1on103 (Fig. 4) which is mounted in-a bearing 104 on the base 1. The axis of the trunnion 103 intersects the axis of rotation of the table 3 and the axis of the spindle 95. It will thus be seen that the frame 101 is arranged to swing about an axis which intersects the axis of the blank I gears having varying angles. The means for pivotally adjusting the frame 101 compr ses 105 (Fig. 1) fixed to said frameand meshing with a pinion 106 (Fig. rotatably mounted in the main frame 1; Rigid with said pinion is a worm wheel 107 that meshes with a worm 108. The shaft of the worm 108 has a squared end 109 to receive a hand crank (not shown).

a curved rack or spur-gear segment By rotating the worm .work spindle 95 will next be described. The

a bearing 112 alined frame 101 comprises with the bearing 100. In the bearing 112 is rotatably supported a sleeve 113 which is rigid with a gear case 114. Rigid with the gear case 114 is a bevel gear segment 115 (Figs. 1, .5 and 10) which meshes with a bevel pinion 116 that is rigid with a pinion completed in the gear'blan a 117. The pinion 117 meshes with a curved rack or spur-gear segment 118 which is supported for movement upon the frame 101. The segment 118 meshes with a pinion 119 (Figs. 1 and 4) fixed upon the constantlyrocking shaft 14. The spindle 95 is caused to osci late with the gear case 114 by reason of the fact that the gear ease carries a worm 120 (Figs. 3 and 10) 'that meshes with a worm w eel 121 which is splined on the spindle. After a tooth space or ove has been the spindle 95 is turned with relation to the gear case 114 in order to bring another portion of the blank into position to be'grooved by the cutters 41. The means for thus indexing the gear blank includes the worm 120 an worm wheel 121 hereinbefore mentioned. The worm 120 is mounted'upon a shaft 122 to which is fixed a change gear 123 (Fig. 2). The gear'123 meshes with a change ar which is rigid with a gear 125. T e latter meshes with a gear 126 which is fixed upon a shaft 127. Also fixed upon the shaft 127 is a; drum 128 (E5 13) carrying a dog 129 (Fig. 11). This isadapted to be engaged by a ratchet} 130 which is rotatably mounted upon the shaft 127 within the drum 128. Fastened to the hub of the ratchet wheel 130 is a spur gear wheel 131 (Fig.- 13) that meshes with a pinion 132 fined upon a shaft 133. The shaft'133 is connected by means (Fig. 10) with a shaft 135 that extends slidably through a gear case 136 which is pivotally su ported at 137 in a bracket 138 fixed v to the me 101. Within the gear case 136 is rotatabl supported -a bevel gear 139 which is sp ined to the shaft 185, said shaft being freely slidable longitudinally of r' 186 vis a.

with the bevel.

ggar 139. Within the ,vel gear 140 thpt'in es gear 139 and is fixed to a shaft 141 (Fig. 1). The shaft 1411s axially alined with the pivot 137. To the lower end of the shaft 141 is fixed a bevel gear 142 that meshes with. bevel gear 148flxad upon a shaft 144. The

I: as shaft-144 iat otltably supported in the can portion 1 of the main.

. end of the rod 153 is pivoted to one opening 163 through '.-which of a universal joint 134 guide 170 on th underlies a coll wheel 130 is therefore constantly, rotating.

A spring 148 (Fig; 11) acting against a finger 149 fixed wit m ationto the dog 129 tends to swing. the dog into the path of the teeth of the ratchet wheel 130. The do 129 is normally held away from said teet as shown in Fig. 12, by means of a hook 150 adapted -to engag'e'thefinger 149, said hook beivnvglfixed to a rock shaft 151.

' en the cuttershave returned to their initial position, the hook 150. is raised by the tripping shaft 151 to allow the dog 129 to be engaged by the ratchet-wheel 130, thereby causing the shaft 127 to be rotated one or more times and thus causing the spindle 95 to turn through the proper distance to enable the cutters, upon their'next forward movement, to form the next-tooth space. The means for raising the hook 150 comprises an arm 152 (Fig. 1) fixed to' the shaft 151 and pivoted to tends slidably through-a guide"154 .(-Fi gs.

a rod 153; The rod l53'exr.

'5 and 10) on the gear case 114." The flower arm of a lever 155 carried 'by the gear case, the q other arm of said levcrrcsting upon a plate 156. The plate156 is curved upon the arc of a circle concentric with the axisiupon which the pear case 114 oscillates, and said plate is 0 sufficient length so that it is always beneath the lever 155. The plate 156 is secured to a rod .157 (Fi 2 and 5) which is supported for llongitu inal movement upon the frame 101., Fixed to the rod 157 is an arm 158 carrying a beveled pin 159. A 160 curved upon.v the arc of a circle concentric with'the trunnion 103 is supported. upon the frame 101; in the bearin 161 and 162. Intermediatagthe bearings 16 and 162 the rodlBO basin elongated extends a guide pm 164 set in the'frame 101. Upon the 11 per end of the rod 160 is a beveled pin 165 a apteduponthe upward movementof the rod 16010, as on er and lift the pin 159 and thus li the" late 1156 and the adjacent arm of the lever 55', whereby the shaft 151 is turned to. raise -the hook 150 out of en- The finger pivotally upon the e rod 160 so as to ring 166-normally i a pt d-wane. downward movem'e' as the pin 159;.

172 which is adjustably mounted upon the rod 160. The other arm 39 Iolds the pin 165- imtlidposition' shown in 1 rrying a roller 171 that i In Fig. 13* the disks are shown as so ad-- ndtches in the disks 177 and 178.

the 'hook 150 is lifted out of engagement of the lever .167 carries a rod 173 (Fig. 3)which extends axially of the shaft 63. The upper end of the rod 173 is beveled for engagement by a correspondingly beveled surface upon the collar 17 1 fixed upon a tube 175 which is rigid with thenut 67 and surrounds the lead screw 66. 'When, in the return movement of the cutters, the collar 174 engages and forces downward 'the'rod Y 173, the rod 160 is lifted to raise the plate 156 and thus cause the hook 150 to be movedaway from the finger 1 19. A

spring 176 11) tends to move the hook 150 downwardly.

The hook 150 is held up out of the orbit of the finger 149 for therequired length of time by means of an adjustable device comprising two notched plates 177 and 178 (Fi 13, 13 and 13)" These disks have note ies 179 in their peripheries. In the construction herein shown', the disk 177 has seven notches "179, while the disk 178 has four notches. The disks are located side by side and are relatively adjustable so as to brin desired notches in the disks into register. 7 n Fig. 13 the disks are shown as so adjusted that notches are in register at two diametrically opposite points.

justed that notches are in register at only one point The disks may be adj ustably so cured together in any suitable manner, as by means of a spring plunger 177 (Fig. 13) carried by the disk 177 and adapted to enter concave notches in the disk 178. The disk 178 is fixed u on the hub of a spur gear wheel 180 (11' ig. 13) which is rotatably mounted upon .'a stub shaft 181 in the gear casing 114. The spur gear 180 meshes with a imon 182 which is rigid with. the shaft 127. A pin 183 on the hook 150 is ath ptedv to ride upon the peripheries of the disks 177 and 178 and drop into two registering otches 179 in said disks. In the construction herein illustrated, the ratchet wheel 130 makes four revolutions to one revolution vol disks 177 and 178.

, Normally the hook 150 is in engagement with the finger 1G9; and the pin 183' lies in two registering with the fin or 149, the pin 183 is held up by the perip cries of the disks 177 and 178 thus causes the dog 129 to be disengaged.

zil'hlil fl two registering notches in said disks reacIi said pin, whereupon the hook 150 drops into the path of the finger 149 and from the ratchet wheel.

'lo'preveut rebound of the drum 128 and consequent vibration of the spindle 95 when the finger 149 strikes the hook 150, I provide a-dog 184 (Fig. 12) which is loosely mounted-upon the shaft 151 and yieldingly held in contact with the periphery ofthe drum When 'spond with the root cone of the fgear to be eriphery of the drum 128 is a stop pin 186. y the time that the hook 150 has disen: gaged the dog 129 from the ratchet wheel 130 the stop pm 186 has just passed the locking dog 184. It will be seen that when the parts are in the position shown in Fig 12,. the hook 150 prevents rotation of the rum 128 in one direction, and the stop pin 186 and the locking dog 184 prevent rotation of the drum in the opposite directioii.

When it is desired to change the adjustment of the disks 177 and 178, accessis had to said disks through the opening 187 (Figs. 10 and 13) in the gear case 114.

In operation, the cutters 41 are fed from right to left (Fig. 3), said cut ers forming a,

tooth space in theblank asthey are fed in said direction. During their leftward travel the cutters gradually approach each other (as will be understood by reference to Fig. 1) by reason of the inclination of the guides 27, thus causing the tooth s ace to taper toward the apex of the pitch cone of the bevel gear being formed. While the cutters are being advanced, the table 3 and the blank-carrying spindle are oscillated synchronism, whereby the tooth space in the blank is generated through the rolling of the cutters and theblank upon each other. The

,collar 93 is located u on the rod 91 in such position that when t e cutters have through the blank, the lug 92 strikes said collar. 93 and-tli reby causes the clutch member 78 to be shifted into engagement with thespur gear wheel= 77, thus causing the directlon o reversed. The cutters are then caused to travel at a greater speed in the right-hand direction Fig. 3), the cutters traveling through the tooth space just formed. As soon as the cutters have assed through said tooth space, the collar 1 4 engages the rod 173 and causes the indexing mechanism to be actuated to turn the blank through the distance of one tooth and thus lace the blank in position for the cutting o the next tooth space; By the time the indexing of the blank has been effected, .the lug 92 hasengaged the collar 94 and caused the clutch rotation of the lead-screw 66 to be,

The frame 101 is adjusted upon the axis of its trunnion 108 into position to correformed. Before adjusting the rame, the arm 12 is raised to separate the gears 11 and 12, and the pinion 15 is unclamped from the rocker shaft 1 1'. After the frame 101 and the parts carried thereby (including thev Segment 118) have been adjusted to thede" cars 11 and 12 areplacedin sired angle, thjil meshwith eat ether, and the pinion 15 is 65 128 by means of a spring 185. Set in the upon tlr efrocker shaft.

The bearing 100 carrying with it the; spindle 95 is adjusted up and down on the frame 101 as required to present blanks of varying diameters to the cutters.

The change gear train 123, 124, 125 and 126 and the hook-controlling disks 177 and- 178 permit the length of the indexing movement to be adjusted to correspond with the pitch of the gear to be formed.

Byrreference to Fig. 4, it will be seen that the pivotally-adjustable frame 101 has a single trunnion 103 which projects from said frame in a direction away from t'hetable 3.,

As shown in Fig. 2,, the bearings 100 and 112 are located at one side of the frame 101.

v The trunnion 103 and the bearings 100. and

" the teeth 112 proj eet from o posite sides of the frame 101. By reason 0 this construction and ar rangement of the parts, ample space is providedfor the table 3 in its osdillating move ment, and provision is made for supporting gear blanks of large diameter and of various root cones.

Referring to Fig. 1: The gear wheels 22 and 23 are supported upon a bracket 188 which is pivoted upon the axis of the shaft 25 and is held in adjusted position 'by means of a clamping screw 1S9 extending through a slot 190 in said bracket and into the base of the machine. If it be desired to form the teeth of the gear blank in two operations, the'bracket'188 may be raised to disengage the pinion 22 from the gear wheel 21, and roughed out while the table 3 and thegear case 114 are stationary at the central point of their are of oscillation. After the gear blank has made a complete revolution, the generating movement may be thrown in by lowering the bracket 188 to normal position, and the blank rotated stepby-ste'p through a second'revolution, during which revolution the cutters complete the cutting of the teeth.

When the cutting faces 41 of the cutters are at right angles to the axes 42-43 of the cutters, a slight bur on the cutting face will produce scratches on the gear being formed.

It is therefore preferable to make the cutting face slightlyconical, as it has been found that when so made a slight bur on the cutting edge does not cause scratches. 1f the teeth of the gear to be out are formed with a 144 pressure angle, the axes may be set at an angle, of 14 and the cutting faces of the cutters inclined at an angle of one-half degree from a plane perpendicular to the respective axes of the cutters. In Fig. 9, the inclination referred to of the cuttingface is not perceptible. In Fig. 6, the perpendicular is indicated by a dotted line.

The description hereinbefore given of the operation of the machine may be summarized as follows. Referring to Fig. 3: In traveling toward the left, the cutters form. a groove in the blank, Owing to the oscilshaped to form lating movements of the table 2 and'tiie gear blank, occurring during. the travel of the cutters, the side walls 'of the the adjacent si es of two correctly generated gear teeth. Thile the cutters are thus advancing through the work, the cutters are approaching each otherbecause of the convergence of the guides 27,

hence the tooth space or groove becomes'tapered toward the apex of the pitch cone of the bevel gear-being generated. The tooth space having been completed, the travel of the cutters isreversed, the return movement thereof being at a greater-speed than the working stroke. v I turned clear of the blank, the latter is turned After the cutters have re through the distance of one toothspaoe by the indexing mechanism. The travel of the cutters is then reversed, and another'tooth space formed inthe blank. \Vhen the gear has been completed, the operator stops the machine, replaces the finished gear with a blank, and restarts the machine.

I claim as myinvention: I

1. Amachine for generating gear teeth having, in combination, cutting means comprising a plurality of intermeshing cutters adapted to occupy a tooth-space, devices for supporting said cutters, means for rectilinearly reciprocating said supporting devices,

each stroke thereof being continuous, means for oscillating said supporting devices, and means for rotating a single one of said outters whereby all of said cutters will be to tated, said rotating means including a flexible connection, whereby said cutters may be rotated, reciprocated and oscillated synchronously.

2. A machine for generating gear teeth having, in combination, cutting means comprising a plurality of intermeshing rotatable cutters adapted to occupy a tooth-space, devices for individually and adjustably supporting said cutters, said supporting devices being angularly adjustable with relation to each'other, means for oscillatingsaid supporting devices, means for rectilinearly reciprocating said supporting devices, said reciprocating means having automatic reversing means, said cutters alternately converging and diverging upon the forward and return movements of said supporting devices, and means for rotating said cutters synchronously. with the said reciprocation, oscillation, convergence and divergence thereof.

A machine for generating gear teeth having, in combination, cutting means corn-g prising'a plurality of intermeshing cutters adapted to'occupy a tooth space, nieans'for adapted to occupy having,

stroke thereof being continuous, means for oscillating said cutters, and means for rotatin a single one of said cutters all 0 said cutters will be rotatedf 5. A machine for generating gear teeth having, in combination, cutting means com prising a plurality ofintermesh'ing cutters a tooth'slot, devices for supporting said cutters individually; said supporting devicesbeing angularly adjust-' able with relation'to each other, means for rotating a single one of said cutters whereby all of said cutters will be rotated, and means for imparting a rectilinearly reciprocating movement to saidsupporting devices whereby said supporting devices will alternately approach and diverge synchronously wlth said reciprocation.

6. A machine for generating gear teeth in combination, cutting means comprising a plurality of cutters adapted to occupy a tooth-space,- devices for individually supporting said cutters, said supporting devices being angularly adjustable 'with rela tion to each other, means for oscillating said supporting devices, means for rectilinearl reciprocating said supporting devices, eac stro (e thereof being continuous, said cutters will alternately converge and diverge, and means for rotating mid cutters, said rotating means including flexible means whereby said cutters may be rotated, reciprocated and oscillated synchronously with,

the convergence and divergence thereof.

7, A machine for generating gear teeth having, in combination, cutting means comprisingra pair of rotatable cutters adapted to occupy a tooth-space, devicesdor individually and adjustably supptrtmg, said cutters, sald'supporting devices being angularly adjustable with relation to each other, means for oscillating" said supporting devices, means for rectllmearly reciprocating said supporting devices, said rectilinearly recip 'rocating means having automatic reversing means and a quick return movement, said cutters alternately converging and dlvergmg upon the forward and the return movements 'of said supporting devices, and means for lated synchronously rotating said cutters, said rotating means including flexible means whereby said outters may be rotated, reciprocated and osciland divergence thereof.

8. A machine for generating gear teeth having, in combination, clutch-reversing means comprising a cam element on' the machine, travel-limit means, a member actuated by said travel-limit means, slidable clutch member adapted to engage driving means, an actuating device on said travelwhereby whereby segment adjustably'and rigidly secure with the convergence limit actuated member, and Gillil lfifillll} means operatively amociated with sax clutch member and said-.traveLlimit-actuated member, said connecting means 1ncluding a member having a lost motion conclutch member to encam element whereby I in combination, a cam;

element on the machine, travel-limit meansg' 1 a member actuated by said travel-limit ng means, a slidable clutch member adapted to engage driving means,

' is delayed and is thereafter quickly actuated.

10. ,A driving mechanism for rotating an element upon an oscillating part comprising a stationar part, arotating driving member supported v the stationary part, a rotatable an actuating device on said travel-limit actuating member, and' dl'lVeIl member oblique to said rotating memher, a universal flexible connection having one end secured to the element and the other end secured to said rotatable driven member, means secured to Said drivin member and rotatable therewith, means sli ablly; and nonrotatably carried by said rotata 1e driven member and operatively connected to said means secured to the driving member, and a bearing member having a pivotal connection with the stationary part, said bearing member rotatably and shdably supporting said rotatable driven member and engageably securing said operatively connected means upon said driven and driving mem- 11. A machine for generating gear teeth having, in combination, work-holding means, cutting means, and means for synchronously oscillating said work-holding means and said cutting means, said oscillating means comprisin a rotating-member, a pitman eccentrica 1y carried by said member, a ear to said pitman, a rocker-shaft actuated by said gear segment, and separate means secured to said shaft and operatively connected to connected to said holder andsaid gear teeth having,

means for rotating said cutter, meansfor synchronously oscillating the gear-blank and the cutter, said oscillating means including a common rocker-shaft, separate means secured to said shaft and operatively cutter, and eccentric means... for actuating said shaft, means 13. A machine for generating gear-teeth having, in combination, a base, a gear-blank support adjustably supported bythe base,

a gear-blank holder rotatably supported by said support, a table rotatably supported by said base, a cutter supported by said table and adapted to occupy a tooth-space, means for rotating said cutter,'means for recti- Y linearly reciprocating said :cutter, means synchronously oscillating said gear-blank holder and said cutter, said oscillating means including a means secured to said shaft and operatively connected to said holder and said cutter, and eccentric means for actuating said shaft, actuating mechanismffor automatically indexing. said gear-blank holder, means operated by said reciprocating means for controlling the actuation of said indexing mechanism, and means for ctuating all of said means. i

14. An automatic machine for generating in combination, a base, a member rotatable thereon, a support adjustably supported by the base, cutting means reciprocable on said member, work-holding means rotatable in said support, means for synchronously oscillating said member and said. Work-holding means, indexing means,

and means operable in the reciprocatory' movement .of said cutters for actuating said indexing means to obtain relative movement between said cutting means and said workholdin means.

machine for generating gear teeth having,

in combination, a base, a gear-blank holder adjustably supported by said base, a

table rotatably' supported by said base, a cutterslidably supported by said table and adapted to occupy a tooth-space, means 1" a rotating said cutter, means for rectilinearly reciprocating said cutter, means for synchronouslyoscillating sald table and said holder, indexing mechanism for obtaining relative movement between said cutter and said gear-blank holder, and means for actuating all of said means.

16. A machine for generating gear teeth havin in-combination, a base, a member rotata le thereon, a. support adjustablysupported by said base-,cutting means reciprocable on said member, work-holding means rotatable in said support, means for synfor V automatically indexing said gear-blank holder-independent of said oseillatingmeans, and means for actuating all of said means.

. relative movement rocker-shaft, a separate] oscillatory chronously oscillating said member and said work-holding means, adjustable. indexing means carrie by said work-holding, means,

and-tripping mechanism operable in the reciprocatory m'ov'ement'of said cutters for tripping said indexing means to obtain relative movement between said cutting means and said work-holding means.

17. A machine for generating gear teeth having, in combination, a gear-blank holder,

. a plurality of intermeshing cutters adapted to occupy atooth-spaee, means for rotating saidflcutters, means for synchronously oscillating the gear-blank holder and the cutters, automatic indexing means for obtaining between said cutters and said gear-blank-holder, andmeans'f actuating all of said means. I

18.'A machine for generating gear teeth having, incombination, means, a plurality of intermeshing'eutters ada tedto occupy a tooth-space, means for rectilinearly reciprocating said cutters, each stroke thereof being continuous, means for oscillating said.cutters, and means for retating a ,single one 'ofsaid cutters whereby all of said cutters will be rotated.

'19. A-machine for generating gear teet having" in combination, work-holding means, a plurality of intermeshing cutters work-holding means, indexing means, and said cutting means formeans operableb actuatingsaid 1n exing means.

21 A machine forgeneratmg gear teeth having, in combination, a base, cutting means oscillatable and reciprocable thereon,-

oscillatory work-holding means supported by said base, indexin'g'means, and means operable by said. cutting means in the reciprocable movement thereof for actuating said indexing means. I

22. A, machine for generating gear teeth work holding having, 1n combination, a base, cutting means 'rectilinearly reciprocable thereon, work-holding means, adjustable indexing means, and meansoperable by said cutting means for actuating said indexing means.

23. A machine for generating gear teeth having, in combination, a base, cutting means oseillatable and reciprocable thereon, work-holding means supported by said base, adjustable indexing means, and means operable by said cutting means in the reciprocable movement thereof for actuating said indexing means 24. A machine for generating gear teeth having, in combination, a base, reciprocable cutting means, oscillating work-holding cutting having,

said oscillating means, actuating indexing said work-holding means. tripping means for actuating said indexing means conn'irising a tripping shaft, a slidable n'iember operatively connected thereto, an arcuate plate transverse to and carried by said slidablc member concentric with the axis of said oscillating work-hold ing means. and slidable means carried by said base. and. operatively connected to said arcuatc plate for shaft.

2?. A, machine for generating gear teeth having. in combination. a base, reciprocable i'neans. oscillating work-holding indexing said work-holding IllOilli-h. IIIQIIIIS IlltPilllS, HMRHS means. tripping means for dcxlng means comprising a tripping shaft,a

slidablemembcr operative yconnected therei to, an arcuate plate transverse to and carried I said axis of said oscillating \\'ork-holding means, and slidahle means carried by said base, operatively connerted to said arcuate plate for actuating said tripping shaft and actuated by said recipmcahle cutting means.

26. A machine for generating gear teeth in combination, a base, reciprocable means lllOl'tfQll. a support adjustably secured to said base, oscillating work-holding means, indexing leans for said workhohling means, tripping means carried by said oscillating means. actuating means on said support operatively connected to said tripping means. :uljustable means comprising an arcuate member having a slidablc connection with said support, a spring controlled dog pivotally secured near one end to! slidably actuating said connecting cutting means, and. a collar adjustably secured near the base. andfmeans secured to said base having a, part contacting said collar for slidahly actuating said arcuate member.

.47. A machine for generating gear teeth ha ving, in combination, a. base, rcciprocable cutting means thereon, a support adjustably serured to said base, oscillating work-holding means. indexing m ans for said u'orkholding means, tripping means carried by means on said. support operatively connected to said tripping means. ad ustable means 'comprising an arcuate member having a shdablo connection with said support, a spring controlled dog pivotally secured near one end. for slidahly actuating said connecting means. and a collar adjustably secured near the base, and means secured to said base, actuated by said reciprocahlc cutting means and having a part contact ing said collar for slidablv actuating said arcuate member.

28. A machine for generating gear teeth having, in eon'ibination, a base, arotatablo cutter support, a rotatably adjustable support, the axis thereof intersecting the axis actuating said tripping actuating said in:

slidahle member concentric with the table mounted for thereof,

of said cutter support, adjustable workholding means. the axis thereof intersecting the other a conical bevel gearlank secured to said holding means, the apex of said blank intersecting the intersection of said a plurality of cutters adapted to occupy a. tooth slot, said cutters being adjustable and rotatable upon said rotatable cutter support, said cutters and said holding means being synchronously oscillatable, indexing means for said holding means, tripping mechanism actuated in the reciprocation of Stilt cutters, and means for actuating all of said means.

29. A machine for generating 'rame, a support, a trunnion thereon axes, cutting means comprising otally mounting said support on said frame for adjustment, the axis of said table intersecting the axis of said support at right angles, work-holding means mounted for oscillation on the support, the axis of said work-holding means intersecting the other two axes, and means located adjacent said said table and at one side of both for oscillating the work-holding means and the table.

' 30. A machine. for generating gear teeth having, in combination, a mainframe, a oscillation on the main a support, a trunnion thereon pi'votally mounting said support on said frame for adjustment, the axis of said table intersecting the axis of said support at right. angles, hearings on said support and Workholding means mounted in said bearings, the axis of said work-holding means intersecting the other two axes.

J machine for generating gear teeth having, in combination, a main t'ran'ie, a table mounted for oscillation on the main frame, a support having a single locater at one side of the table, the axis of said trunnion intersecting the axis of the table, bearings located on said support, said bearings being at one side of the support and said trunnion hcing=at the other side. thereof; and a work spindle carried by said bearings, the axis ofsaid spindle intersecting the other two axes. s

32. machine for generating gear teeth in combination, a. main frame, a iscillation on the main support having a single trunnion located at one side of the table, the axis of said trunnion intersecting the axis of the table, bearings located on said support, said bca rings being at one side of the support and said trunnion being at the other side and a Work spindle rotatably frame, a

mounted in said bearings. the axis of said spindle intcrseta mg the means ad acent said other two axes, and support and said table trunnion' ins main frame and having a single trunnion support, bearings located on said supporting frame, said bearings being at one side of the support and said trunnion being at the other side thereof, a rotatably mounted cutter support, a rotatably mounted work-spindle, one

' of said parts, to wit, the cutter support and 7 driving means main frame and I feeding the cutter,

' pendicular to said equaling the pressure angle the work spindle, being mounted .on said the other of said parts being mounted in the bearings, the axis of said cutter supglort intersecting the axis of said work-spin intersecting the other two axes, cutters rectilinearly reciprocable upon said cutter support, and mean. for-oscillating said cuttersupport and said work-spindle for producing a'sinuous'cuttin'gmotion for generating a a theoretically curaed'tooth-face.

34. A machine for generating gear teeth having, in combination, a cutter, a blank support, oscillating means for rolling the cutter and the blank su port upon each other, and mechanisms or rotating and feeding the cutter, being inclinedto the plane in which the cutter is oscillated, and the cutting face of the cutter being inclined at an angle to a plane Kerpendicular to said axis.

35. mechanism having, in combination, a frame, a shaft rotatably mounted thereon, rotatable upon said shaft for driving the same, a clutch slidably andnonrotatably mounted u gagement with said riving means, and actuating means for sliding saidclutch wheremember operatively connected with sai slidable element, and movable thereby, said connecting member further having a slidable connection with said cam member and a lost-motion connection with said clutch.

'36. A machine for generating bevel-gear teeth having, in combination, a table, a cutter on the table, oscillating the table and the blank support torollthe cutter and the blank upon each other, and mechanisms for rotating and the axis of the cutter'being"'nclinedv to -the plane in which the-table is oscillated, and the cuttin ter being inclined at an ang e to a plane peraxis, the angle of inclination of the cuttenaxis plus the angle of inclination of the-cutting; face of the cutter being generated.

e and the axis of said trunnion the axis of the cutteron said shaft for en a blank support, means for face of the cutof the gearteeth' means for reciprocated to said cutter, a shaft connected to said gearin and including a universal joint, a isk sidably and non-rotatably supported upon said shaft, said disk lying in said chamher and devices loosely connecting said disk and said rotatable driving member.

39. A machine for having, in combination, a cutter adapted to occupy a tooth space, means for rotatingsaid cutter, synchronously oscillatin the holder and the cutter, sai including eccentric means gear-blank generating gearteetha gear-blank holder,

means for oscillating means.

for oscillating the cutter and gear means operatively 'associated with said eccentric means for synchronously "oscillating said gear-blank holder, means for automatically indexin said gear-blank holder independent of sai oscillating means, all of said means.

40. A machine for generating gear teeth having, in, combination, a main frame, a

table mounted for oscillation on the main frame, a support, a trunnion thereon ivotally mounting said support on said ame for adjustment, the axis of said table intersecting the axis of said support at right an-,

gles, work-holding means mounted for oscillation on the support, the axis of said work holding means intersectin the other two axes, and means located a jacent said sug port and said table for oscillating the wor holding means and the table. a

41. In a machine, the combination of a base, a table oscillating thereon,.a pair o guides each rotatably mounted upon me table, a cutter-supporting slide reciprocable upon each guide, eluding a pair of links each pivotally secured at one end to a slide and at the other to reciprocating means, and means for securing said guides 1H adjusted position upon said,

and means for actuating and means for locking the bearing in adjusted position comprising a wedge reciprocating means illslidable between said bearing and said guide, a, screw secured in a recess in said bearing, and a nut rotatably mounted on said screw and in a recess in said wedge.

43. A machine having, in combination, a cutter-supporting slide provided with a guide, a bearing supported by said guide and slidable thereon, a screw secured to said guide, a nut rotatably mounted in' a, recess in said bearing, and means forlocking the 10 hearing in ad]usted position.

In testimony whereof, I have hereunto set my hand. GUSTAF DAVID SUNDSTRAND.- 

